David is in the habit of knitting his brows whenever he concentrates on a problem.此句子中whenever至最后那一部分是做什么成分的?

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David is in the habit of knitting his brows whenever he concentrates on a problem.此句子中whenever至最后那一部分是做什么成分的?
David is in the habit of knitting his brows whenever he concentrates on a problem.此句子中whenever至最后那一部分是做什么成分的?

David is in the habit of knitting his brows whenever he concentrates on a problem.此句子中whenever至最后那一部分是做什么成分的?
whenever he concentrates on a problem=no mtter when he concentrates on a problem 是个让步状语从句
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